Other 3rd party applications that filter Internet traffic (such as antivirus or content filtering appliances)

Low disk space on the System drive

Solution

As this issue can have more than one cause, it may be necessary to try any/all of the solutions below to resolve this issue:

Confirm that there is sufficient free space and no disk usage quotas preventing LiveUpdate from writing to its temporary Downloads folder on the %SYSTEMDRIVE% (Note: LiveUpdate can be installed to any arbitrary drive location on the system, but the Downloads directory is always located on the %SYSTEMDRIVE%).

It may be necessary to free disk space by deleting the contents of the LiveUpdate Downloads folder at:

%SYSTEMDRIVE%\ProgramData\Symantec\LiveUpdate\Downloads on Windows Vista and above